Stable philosophical ground

Hello,
For a long time now I have been unable to land on solid philosophical ground. I will explain what I mean.
I cannot claim to be a great expert in philosophy, but I am familiar with the basic ideas of key thinkers.
The more I learn, the more I feel the futility of learning, like grinding water. I mean, of course the learning itself matures and the learner himself matures towards a more solid philosophical position, but in my case it just doesn't feel that way.
The further I go chronologically along the philosophical timeline, the more I feel like we are doomed not to know. I was particularly deeply impressed by the ideas of thinkers like Nietzsche, Freud, and Schopenhauer, and then the post-structuralists (and of course similar ideas in the East).
I have come to the point where I feel that choosing a moral or ideological position is a matter of convenience or aesthetics and nothing more. Every position we hold is merely a comfortable illusion, which we hold simply because it helps maintain a certain stability.
 
I would appreciate advice.
Thank you, Harel.